RDX Speed Ball Boxing Genuine Leather MMA Muay Thai Training Punching Dodge Striking Bag Kit Hanging Swivel Workout Patent Pending Speed Ball comes with RDX elite swivel made from a high grade of stainless steel and constructed with quality bearings Cow hide leather material is lined inside with 4 layers of poly cotton material Each ball is individually shaped and balanced for rebound accuracy, Tough construction Lightweight design means lightning fast rebounds, Guaranteed quality Riveted attachment provides superior durability, Double-lined hanging strap discourages splitting